Yeah, I went and looked at my NSF review sheets, or whatever they're called...got all top marks on intellectual merit (i came up with a research proposal I really liked, though I didn't really share it with most of my recommenders...possibly a mistake, since I'm sure they didn't mention it in their letters), but my "broader impacts" scores were only average. I knew this was going to be what made or broke it in the end, and I thought I had my bases covered, but evidently not well enough. Word to the wise for anyone else applying for this fellowship: stress your broader impacts like you are the lynchpin on which all of physics hangs and you should do well in the ratings! And btw, I really think NSF is a class act for allowing you to see your review sheets...if all of our grad schools and fellowship programs did this, I think almost all of us would have a better chance of getting what we wanted the second time around!
As far as reapplying, I still haven't heard from 2 fellowships, and if I don't get either (or get the lesser-valued of the two), then I'll most likely reapply next year (and defer funding) if I manage to pull it off.
As far as decisions go, Caltech was awesome, I probably had a good hour and a half of face-to-face time with John Schwarz, and the whole program is so diverse and fascinating. However, Princeton is really pressing me to come and they are offering me a ton of flexibility in terms of designing my academic/research program, so I think I'm going to accept Princeton's offer. I need to get some new clothes! something tells me the shirts and shorts that worked well in AZ are not going to do much good in december in NJ!